1. Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Košice, Slovakia
2. Department of Ophthalmology, University Hospital Louis Pasteur and Pavol Jozef Šafárik University, Košice, Slovakia
3. Department of Anaesthesiology and Intensive Medicine, Faculty Hospital with Polyclinic J.A. Reiman, Prešov, Slovakia